Foamed mixture road structure and construction process thereof

Abstract

The application provides a foamed mixture road structure and a construction process thereof, and belongs to the technical field of road structures.The foamed mixture road structure and the construction method thereof comprise the following steps: mixing and stirring phosphate cement, sulphoaluminate cement, carbide slag, phosphogypsum, raw soil, a modified polymer foaming agent and water uniformly, pouring and forming, and curing to obtain a foamed soil roadbed; mixing and stirring aluminate cement, water glass, calcium chloride, basalt fiber, an animal protein foaming agent and water uniformly, pouring and forming, and curing to obtain a foamed concrete road surface base layer; heating base asphalt, then adding graded gravel, silica fume, limestone powder, water-based epoxy resin, organic nanomaterials and water into the heated base asphalt and stirring uniformly, paving, rolling, curing and obtaining a micro-bubble asphalt road surface layer.The application can solve the problems of low road structure stability and durability in road engineering in permafrost regions.

Description

Technical Field

[0001] This invention belongs to the field of road structure technology, and more specifically, relates to a foamed mixture road structure and its construction method. Background Technology

[0002] Chinese invention patent with publication number CN111395093A (application number: CN202010203391.2) discloses a crack-resistant emulsified asphalt cold recycled mixture pavement structure and its preparation method, belonging to the field of road engineering technology. The crack-resistant emulsified asphalt cold recycled mixture pavement structure is set on the surface layer after the pavement is milled, including a fiber layer and an emulsified asphalt cold recycled mixture surface layer.

[0003] As can be seen from the above inventions and general road structures, the roadbed in a road structure is generally made of compacted sand and gravel, the pavement base layer is usually made of cement-stabilized materials, and the pavement surface layer is mainly made of asphalt concrete or cement concrete. This type of road structure has poor thermal insulation and frost resistance. When applied to road engineering in permafrost areas, it is prone to serious problems such as thaw settlement, frost heave, and landslides caused by the melting of the permafrost foundation beneath the road structure. This highlights the problem of low stability and durability of road structures in permafrost areas due to temperature changes in the permafrost foundation and structural defects. Summary of the Invention

[0004] In view of this, the present invention provides a foamed mixture road structure and its construction method, which can effectively solve the problem that the stability and durability of road structures in permafrost areas are easily affected by changes in the temperature of the permafrost foundation and road structure defects.

[0005] This invention is implemented as follows:

[0006] The first aspect of the present invention provides a foamed mixture road structure, which, from bottom to top, comprises a foamed soil subgrade, a foamed concrete pavement base course, and a micro-bubble asphalt mixture pavement surface course.

[0007] The technical advantages of the foamed mixture road structure provided by this invention are as follows: Foamed materials such as aerated soil, foamed concrete, and microbubble asphalt mixture have excellent thermal insulation and frost resistance. Furthermore, these foamed materials also possess advantages such as lightweight, high strength, and ease of construction. Using foamed materials such as aerated soil, foamed concrete, and microbubble asphalt mixture in road construction in permafrost regions can provide thermal insulation for the permafrost foundation beneath the road structure, thereby stabilizing the temperature of the permafrost foundation, solving the problem of road structure defects in permafrost regions, improving the frost resistance of the road structure, and thus enhancing the stability and durability of the road structure.

[0008] Based on the above technical solution, the foam mixture road structure of the present invention can be further improved as follows:

[0009] The aerated mixed soil subgrade is prepared by mixing 100-150 parts of phosphate cement, 50-150 parts of sulfoaluminate cement, 20-40 parts of carbide slag, 10-20 parts of phosphogypsum, 400-600 parts of raw soil, 20-40 parts of modified polymer foaming agent, and 150-300 parts of water by weight.

[0010] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the foamed soil subgrade is located at the bottom layer of the foamed road structure and is in direct contact with the frozen soil foundation. It is required to have good thermal insulation performance. At the same time, it is also required to have good integrity to avoid disturbance of the frozen soil foundation caused by differential settlement or differential deformation of the foamed soil subgrade.

[0011] Furthermore, the foaming agent of the modified polymer is prepared by a series of polymerization reactions of the amphiphilic block polymer polystyrene-polyacrylic acid and a surfactant.

[0012] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the bubbles prepared by the modified polymer foaming agent have advantages such as strong uniformity and resistance to defoaming when raw soil is incorporated, which can meet the thermal insulation performance requirements of the aerated concrete mixture. The hydrates generated by the hydration reaction of phosphate cement, sulfoaluminate cement, carbide slag, and phosphogypsum as cementing materials, such as hydrated calcium phosphoaluminate and hydrated calcium sulfoaluminate, have excellent cementing properties for the raw soil. The strength and durability of the cemented raw soil are higher than those of traditional materials such as silicate cement, which can better meet the integrity requirements of the aerated concrete mixture subgrade.

[0013] The foamed concrete pavement base course is prepared by mixing 750-900 parts of aluminate cement, 50-100 parts of water glass, 30-100 parts of calcium chloride, 2-5 parts of basalt fiber, 50-70 parts of animal protein foaming agent, and 450-700 parts of water by weight.

[0014] Furthermore, the animal protein foaming agent is a foaming agent made by adding a certain amount of chemical materials such as caustic soda, hydrochloric acid, and sodium chloride to animal keratin protein, and then dissolving it by heating, diluting and filtering it, and dehydrating it at high temperature.

[0015] Animal keratin, such as pig's trotters, pig skin, sheep's trotters, etc.; caustic soda refers to NaOH.

[0016] The microbubble asphalt mixture pavement surface layer is prepared by mixing 40-60 parts of base asphalt as binder, 20-40 parts of graded crushed stone as aggregate, 20-40 parts of silica fume and 30-50 parts of limestone powder as active filler, 10-20 parts of waterborne epoxy resin as admixture, 80-100 parts of organic nanomaterials as foaming agent, and 450-700 parts of water by weight.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the microbubble pavement surface layer is located at the top of the road structure and is in direct contact with vehicle loads and the atmospheric environment, therefore it is required to have good thermal insulation and splitting resistance; the bubbles prepared by the organic nanomaterial foaming agent have the advantages of high foaming ratio and wide temperature range, and the prepared bubbles have a large amount and can maintain the stability of the bubbles well under high and low temperature conditions, thus meeting the thermal insulation performance requirements of the microbubble asphalt mixture surface layer; the matrix asphalt binder and graded crushed stone aggregate, as basic components, provide the basic splitting resistance of the microbubble asphalt mixture; silica fume and limestone powder, as active fillers, have the function of filling the pores between graded crushed stone, further enhancing the splitting resistance of the microbubble asphalt mixture.

[0018] Furthermore, the foaming agent of the organic nanomaterial refers to a foaming agent prepared by adding organic nanopolymers to an ionic foaming agent and utilizing the self-assembly effect of the organic nanopolymers.

[0019] The wet bulk density of the bubble-mixed soil subgrade is not less than 3.5 kN / m³. 3 The wet density of the foamed concrete pavement base course is not less than 10 kN / m³. 3 The wet density of the microbubble asphalt mixture pavement surface layer is not less than 20 kN / m³. 3 .

[0020] The beneficial effects of adopting the above-mentioned improved scheme are as follows: preferably, the wet unit weight of the foamed soil subgrade is 3.5-7 kN / m³, and the wet unit weight of the foamed concrete pavement base is 10-12 kN / m³. 3 The wet density of microbubble asphalt mixture pavement surface layer is 20-23 kN / m³. 3 .

[0021] A second aspect of the present invention provides a construction method for a foamed mixture road, including the aforementioned foamed mixture road structure, specifically comprising the following steps:

[0022] S01: Weigh 100-150 parts of the phosphate cement, 50-150 parts of the sulfoaluminate cement, 20-40 parts of the carbide slag, 10-20 parts of the phosphogypsum, 400-600 parts of the raw soil, and 20-40 parts of the modified polymer foaming agent according to the design mix ratio, and mix them with 150-300 parts of water to prepare the slurry of the aerated mixed soil.

[0023] S02: Lay a layer of geotextile on the subgrade surface, and then pour the slurry of the aerated concrete mixture in layers, with each layer having a thickness of 0.3 to 1.0 m, until the design thickness of the subgrade is reached. Lay a layer of mesh cloth on each layer of the aerated concrete mixture, and after curing, the aerated concrete mixture subgrade is formed.

[0024] S03: 750-900 parts of the aluminate cement, 50-100 parts of the water glass, 30-100 parts of the calcium chloride, 2-5 parts of the basalt fiber, and 50-70 parts of the animal protein foaming agent, weighed according to the design mix ratio, are mixed and stirred evenly with 450-700 parts of water to prepare the slurry of the foamed concrete.

[0025] S04: The foamed concrete slurry is poured in layers, with each layer having a thickness of 0.12 to 0.24 m. The total thickness of the foamed concrete pavement base is 0.20 to 0.48 m. After curing, the foamed concrete pavement base is formed.

[0026] S05: Heat 40-60 parts of the base asphalt weighed according to the design mix ratio, then add 20-40 parts of the graded crushed stone, 20-40 parts of the silica fume, 30-50 parts of the limestone powder, 10-20 parts of the water-based epoxy resin, 80-100 parts of the organic nanomaterials and 450-700 parts of water to the heated base asphalt and stir evenly to prepare the microbubble asphalt mixture;

[0027] S06: The microbubble asphalt mixture is laid in layers using a paver, with each layer having a thickness of 4 to 10 cm. After paving, it is compacted by static pressure, resulting in a road surface layer thickness of 10 to 20 cm. After curing, the microbubble asphalt mixture road surface layer is obtained, thus completing the construction of the foam mixture road structure.

[0028] Preferably, when pouring the aerated concrete slurry in layers, the thickness of each layer is 0.3 to 0.5 m;

[0029] When pouring foamed concrete slurry in layers, the thickness of each layer is 0.16 to 0.20 m, and the total thickness of the foamed concrete pavement base course is 0.20 to 0.32 m.

[0030] When using a paver to pave micro-bubble asphalt mixture, the thickness of each layer is 6-10cm, and the thickness of the road surface layer after compaction is 15-20cm.

[0031] Based on the above technical solution, the construction method of the foamed mixture road of the present invention can be further improved as follows:

[0032] Furthermore, in step S02, each layer of the aerated concrete mixture is cured immediately after construction, and the curing period is not less than 10 days.

[0033] After the foamed concrete layer described in step S04 is poured, it shall be cured immediately for a period of not less than 10 days.

[0034] In step S06, the microbubble asphalt mixture pavement surface layer is cured immediately after compaction, and the curing period is not less than 8 days.

[0035] Preferably, in step S02, each layer of the aerated concrete mixture is cured immediately after construction, and the curing period is 10-12 days.

[0036] After the foamed concrete layer described in step S04 is poured, it shall be cured immediately for 10 to 12 days.

[0037] In step S06, the microbubble asphalt mixture pavement surface layer is cured immediately after compaction, with a curing period of 8-10 days.

[0038] Compared with the prior art, the beneficial effects of the foamed mixture road structure and its construction method provided by the present invention are: the foamed soil subgrade has good thermal insulation performance and integrity, the foamed concrete pavement base layer has good frost resistance and flexural strength, and the micro-bubble asphalt mixture pavement surface layer has good thermal insulation performance and splitting resistance, thereby solving the problem of road structure defects caused by temperature changes in frozen soil subgrade and improving the stability and durability of road structure. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A flowchart illustrating a construction method for a foamed mixture road provided by the present invention; Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] like Figure 1 The image shows a first embodiment of a foamed mixture road structure provided by the present invention. In this embodiment, the foamed mixture road structure comprises, from bottom to top, a foamed soil subgrade, a foamed concrete pavement base layer, and a micro-bubble asphalt mixture pavement surface layer.

[0047] In the above technical solution, the aerated mixed soil subgrade is prepared by mixing 100-150 parts of phosphate cement, 50-150 parts of sulfoaluminate cement, 20-40 parts of carbide slag, 10-20 parts of phosphogypsum, 400-600 parts of raw soil, 20-40 parts of modified polymer foaming agent, and 150-300 parts of water by weight.

[0048] Phosphate cement is a chemically bonded cement, meaning it is formed through a chemical reaction between metals and acid solutions or salts as basic components. Phosphate cement can be used to produce various heat-resistant and thermally stable materials, anti-corrosion and electrical insulating coatings, and high-performance adhesives. Some of its properties are similar to those of ceramic materials.

[0049] Sulfoaluminate cement is a hydraulic cementitious material with excellent properties such as early strength, rapid hardening, and low alkalinity. It is made from limestone, bauxite, and gypsum as raw materials, calcined at low temperature (1300-1350℃) to produce anhydrous calcium sulfoaluminate (C4A3S) and dicalcium silicate (C2S) clinker as the main minerals. Appropriate amounts of admixtures (gypsum and limestone, etc.) are added and ground together. Sulfoaluminate cement is characterized by early strength, high strength, high frost resistance, corrosion resistance, high impermeability, expansion performance, and low alkalinity. Currently, it is mainly used in: winter construction projects, emergency repair and construction projects, shotcrete preparation, cement product production and precast concrete components, shrinkage-compensating concrete preparation and impermeable projects, and fiber-reinforced cement product production.

[0050] Calcium carbide slag is the waste residue mainly composed of calcium hydroxide after the hydrolysis of calcium carbide to obtain acetylene gas. Acetylene (C2H2) is one of the important raw materials in basic organic synthesis industry. The process of producing acetylene from calcium carbide (CaC2) by adding water (wet process) is simple and mature.

[0051] Phosphogypsum mainly comes in two types: grayish-black and grayish-white. The particle diameter is generally 5–50 μm, and the water content of crystallization is 20%–25%. Phosphogypsum is a solid waste generated in the wet-process phosphoric acid production process, and its main component is calcium sulfate dihydrate.

[0052] Furthermore, in the above technical solution, the foaming agent of the modified polymer is prepared by a series of polymerization reactions of the amphiphilic block polymer polystyrene-polyacrylic acid and a surfactant.

[0053] A poly(tert-butyl acrylate)-polystyrene (PtBA-b-PS) block copolymer was synthesized by free radical telomerization of tert-butyl acrylate and atom transfer radical polymerization (ATRP) of styrene. Then, selective hydrolysis under the action of trifluoroacetic acid yielded an amphiphilic polyacrylic acid-polystyrene (PAA-b-PS) block copolymer.

[0054] Polymerization is the process of converting low-molecular-weight monomers into high-molecular-weight polymers. Polymers possess important properties that low-molecular-weight monomers lack, such as plasticity, fiber formation, film formation, and high elasticity. They can be widely used as polymeric materials for plastics, fibers, rubber, coatings, adhesives, and other applications. These materials are composed of one or more structural units (monomers) and are polymeric compounds synthesized from monomers through repeated reactions.

[0055] In the above technical solution, the foamed concrete pavement base layer is prepared by mixing 750-900 parts of aluminate cement, 50-100 parts of water glass, 30-100 parts of calcium chloride, 2-5 parts of basalt fiber, 50-70 parts of animal protein foaming agent, and 450-700 parts of water by weight.

[0056] Aluminate cement is a hydraulic cementitious material made from bauxite and limestone through calcination, resulting in clinker with calcium aluminate as the main component and an alumina content of approximately 50%. It is then ground into cement. Aluminate cement is typically yellow or brown, but can also be gray. The main minerals in aluminate cement are monocalcium aluminate (CaO·Al₂O₃, abbreviated CA) and other aluminates, as well as small amounts of dicalcium silicate (2CaO·SiO₂), and its color is mostly gray and white.

[0057] Sodium silicate, commonly known as water glass, is an inorganic compound with the chemical formula Na₂O·nSiO₂. Its aqueous solution, commonly known as water glass, is a mineral binder. It is a soluble inorganic silicate with a wide range of applications.

[0058] Basalt fiber is a continuous fiber drawn from natural basalt. It is produced by melting basalt rock at 1450℃~1500℃ and then drawing it at high speed through a platinum-rhodium alloy spinneret. Pure natural basalt fiber is generally brown in color. Basalt fiber is a new type of inorganic, environmentally friendly, high-performance fiber material composed of oxides such as silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, iron oxide, and titanium dioxide. Continuous basalt fiber not only has high strength but also possesses excellent properties such as electrical insulation, corrosion resistance, and high-temperature resistance. Furthermore, the production process of basalt fiber results in minimal waste generation and environmental pollution. The product can directly degrade in the environment after disposal without any harm, making it a truly green and environmentally friendly material.

[0059] Furthermore, in the above technical solution, the animal protein foaming agent is a foaming agent made by adding a certain amount of chemical materials such as caustic soda, hydrochloric acid, and sodium chloride to animal keratin protein, and then dissolving it by heating, diluting and filtering it, and dehydrating it at high temperature.

[0060] In the above technical solution, the microbubble asphalt mixture pavement surface layer is prepared by mixing 40-60 parts of base asphalt as binder, 20-40 parts of graded crushed stone as aggregate, 20-40 parts of silica fume and 30-50 parts of limestone powder as active filler, 10-20 parts of waterborne epoxy resin as admixture, 80-100 parts of organic nanomaterials as foaming agent, and 450-700 parts of water.

[0061] Silica ash is the dust emitted from the exhaust gas during the high-temperature smelting of industrial silicon and ferrosilicon in industrial electric furnaces, which is then collected and treated by a special collection device. In this escaping dust, SiO2 accounts for approximately 90% of the total dust content, and the particle size is extremely small, with an average particle size almost at the nanometer level.

[0062] Waterborne epoxy resins can be divided into anionic resins and cationic resins. Anionic resins are used in anodic electrodeposition coatings, while cationic resins are used in cathodic electrodeposition coatings.

[0063] Furthermore, in the above technical solution, the foaming agent of organic nanomaterials refers to a foaming agent prepared by adding organic nanopolymers to an ionic foaming agent and utilizing the self-assembly effect of the organic nanopolymers.

[0064] Ionic foaming agents mainly refer to ionic surfactants, which can also be considered as ionic surfactants, including cationic surfactants (such as quaternary ammonium salts and amine salts), anionic surfactants (such as carboxylates, sulfonates, and polyacrylamide), and compound surfactants, also known as amphoteric surfactants (such as amino acids and betaine).

[0065] Organic nanopolymers refer to a class of polymers composed of organic nanomonomers as repeating units linked by covalent nanolinking. They include highly cross-linked organic nanopolymers (e.g., highly cross-linked polystyrene) and conjugated organic nanopolymers (e.g., conjugated polyphenylene acetylene).

[0066] In the aforementioned technical solution, the wet unit weight of the aerated concrete roadbed is not less than 3.5 kN / m³. 3 The wet density of foamed concrete pavement base course shall not be less than 10 kN / m³. 3 The wet density of microbubble asphalt mixture pavement surface layer is not less than 20 kN / m³. 3 .

[0067] Wet density refers to the weight of a wet object per unit volume.

[0068] like Figure 1 The image shown is a first embodiment of a construction method for foamed concrete roads provided by the present invention. This embodiment specifically includes the following steps:

[0069] S01: Weigh 100-150 parts of phosphate cement, 50-150 parts of sulfoaluminate cement, 20-40 parts of carbide slag, 10-20 parts of phosphogypsum, 400-600 parts of raw soil, 20-40 parts of modified polymer foaming agent, and 150-300 parts of water according to the design mix ratio, mix them evenly, and prepare a slurry of aerated mixed soil.

[0070] S02: Lay a layer of geotextile on the subgrade surface, and then pour the slurry of aerated soil in layers. The thickness of each layer is 0.3 to 1.0m, until the design thickness of the subgrade is reached. Lay a layer of mesh cloth on each layer of aerated soil. After curing, the aerated soil subgrade is formed.

[0071] S03: Weigh 750-900 parts of aluminate cement, 50-100 parts of water glass, 30-100 parts of calcium chloride, 2-5 parts of basalt fiber, 50-70 parts of animal protein foaming agent according to the design mix ratio, mix them with 450-700 parts of water, stir evenly, and prepare foamed concrete slurry.

[0072] S04: The foamed concrete slurry is poured in layers, with each layer having a thickness of 0.12 to 0.24 m. The total thickness of the foamed concrete pavement base is 0.20 to 0.48 m. After curing, the foamed concrete pavement base is formed.

[0073] S05: Heat 40-60 parts of base asphalt weighed according to the design mix proportion, then add 20-40 parts of graded crushed stone, 20-40 parts of silica fume, 30-50 parts of limestone powder, 10-20 parts of water-based epoxy resin, 80-100 parts of organic nanomaterials and 450-700 parts of water to the heated base asphalt and stir evenly to make the microbubble asphalt mixture.

[0074] S06: The micro-bubble asphalt mixture is laid in layers using a paver, with each layer having a thickness of 4 to 10 cm. After paving, it is compacted by static pressure, and the thickness of the road surface layer after compaction is 10 to 20 cm. After curing, the micro-bubble asphalt mixture road surface layer is obtained, and the construction of the foam mixture road structure is finally completed.

[0075] Furthermore, in the above technical solution, in step S02, each layer of aerated concrete is cured immediately after construction, and the curing period is not less than 10 days.

[0076] After the foamed concrete layer in step S04 is poured, it should be cured immediately for a period of not less than 10 days.

[0077] In step S06, the microbubble asphalt mixture pavement surface layer should be cured immediately after compaction, and the curing period should not be less than 8 days.

[0078] Example 1

[0079] A foamed road structure, from bottom to top, consists of a foamed soil subgrade, a foamed concrete pavement base layer, and a micro-bubble asphalt mixture pavement surface layer. The aerated concrete subgrade is prepared by mixing 100 parts phosphate cement, 50 parts sulfoaluminate cement, 20 parts carbide slag, and 10 parts phosphogypsum as cementing materials, 600 parts silty clay as raw soil, 40 parts modified polymer as foaming agent, and 150 parts water. The foamed concrete pavement base course is prepared by mixing 750 parts aluminate cement, 50 parts water glass, and 30 parts calcium chloride as cementing materials, 2 parts basalt fiber as an admixture, 50 parts animal protein as a foaming agent, and 450 parts water. The micro-bubble asphalt mixture pavement surface course is prepared by mixing 40 parts base asphalt as cementing material, 20 parts graded crushed stone as aggregate, 20 parts silica fume and 45 parts limestone powder as active fillers, 10 parts water-based epoxy resin as an admixture, 80 parts organic nanomaterials as a foaming agent, and 450 parts water. The wet density of the aerated concrete subgrade is 3.5 kN / m³. 3 The wet density of foamed concrete pavement base is 10 kN / m³. 3 The wet density of the microbubbly asphalt mixture pavement surface layer is 20 kN / m³. 3 .

[0080] A construction process for a foamed road structure, comprising the aforementioned foamed road structure, includes the following specific steps:

[0081] Step 1: First, construct the aerated concrete roadbed. Weigh out each cementitious material component, silty clay, and water according to the design mix ratio, mix them evenly, add air bubbles made from a modified polymer foaming agent, and mix evenly to prepare the aerated concrete slurry.

[0082] Step 2: Lay a layer of geotextile on the subgrade surface, and then pour the aerated concrete slurry in layers, with each layer being 0.3m thick, until the design thickness of the subgrade is reached; after each layer of aerated concrete slurry is poured, it is immediately cured until the aerated concrete slurry has the basic strength to meet the requirements for personnel to carry out construction work, and then lay a layer of mesh cloth on it; after the mesh cloth is laid, continue to cure, with a total curing period of 10 days, and after curing, the aerated concrete slurry subgrade is completed.

[0083] Step 3: Next, the foamed concrete pavement base course is constructed. Calcium chloride, weighed according to the design mix ratio, is dissolved in water to prepare a solution and then stirred evenly with water glass to prepare a mixed solution. Then, aluminate cement, basalt fiber, and air bubbles made from nanomaterial foaming agents are added sequentially to the mixed solution and mixed evenly to prepare foamed concrete slurry.

[0084] Step 4: Pour the foamed concrete slurry in layers, with each layer being 0.12m thick, for a total foamed concrete pavement base layer thickness of 0.24m. After each layer of foamed concrete is poured, it is immediately cured for 10 days. Once cured, the foamed concrete pavement base layer is formed.

[0085] Step 5: Next, construct the microbubble asphalt mixture pavement surface layer. Heat the base asphalt to the design temperature, then add water-based epoxy resin, evenly mixed silica fume and limestone powder, graded crushed stone, and bubbles made from nanomaterial foaming agents to the heated base asphalt in sequence and stir evenly to produce microbubble asphalt mixture.

[0086] Step 6: Use a paver to pave the micro-bubble asphalt mixture, with each layer being 6cm thick. After paving, use a double-drum roller to compact it using static pressure. The surface layer thickness after compaction is 12cm. Curing should be carried out immediately after compaction, with a curing period of 8 days. After curing, the micro-bubble asphalt mixture surface layer is obtained.

[0087] Once the above steps are completed, the construction of the entire foamed road structure is finished.

[0088] Example 2

[0089] A foamed road structure, from bottom to top, consists of a foamed soil subgrade, a foamed concrete pavement base layer, and a micro-bubble asphalt mixture pavement surface layer. The aerated concrete subgrade is prepared by mixing 150 parts phosphate cement, 150 parts sulfoaluminate cement, 40 parts carbide slag, and 20 parts phosphogypsum as cementing materials, 400 parts fine sand as raw soil, 20 parts modified polymer as foaming agent, and 300 parts water. The foamed concrete pavement base course is prepared by mixing 900 parts aluminate cement, 100 parts water glass, and 55 parts calcium chloride as cementing materials, 3 parts basalt fiber as admixture, 65 parts animal protein as foaming agent, and 700 parts water. The micro-bubble asphalt mixture pavement surface course is prepared by mixing 60 parts base asphalt as cementing material, 40 parts graded crushed stone as aggregate, 40 parts silica fume and 30 parts limestone powder as active fillers, 20 parts water-based epoxy resin as admixture, 100 parts organic nanomaterials as foaming agent, and 700 parts water. The wet density of the aerated concrete subgrade is 7 kN / m³. 3 The wet density of foamed concrete pavement base is 1 kN / m³. 3 The wet density of the microbubbly asphalt mixture pavement surface layer is 23 kN / m³. 3 .

[0090] A construction process for foamed road structures involves constructing the subgrade, base course, and surface course of micro-bubble asphalt mixture in a bottom-up sequence. The specific construction steps are as follows:

[0091] Step 1: First, construct the aerated concrete roadbed. Weigh out each cementitious material component, silty clay, and water according to the design mix ratio, mix them evenly, add air bubbles made from a modified polymer foaming agent, and mix evenly to prepare the aerated concrete slurry.

[0092] Step 2: Lay a layer of geotextile on the subgrade surface, and then pour the aerated concrete slurry in layers, with each layer being 0.5m thick, until the design thickness of the subgrade is reached; after each layer of aerated concrete slurry is poured, it is immediately cured until the aerated concrete slurry has the basic strength to meet the requirements for personnel to carry out construction work, and then lay a layer of mesh cloth on it; after the mesh cloth is laid, continue to cure, with a total curing period of 12 days, and after curing, the aerated concrete slurry subgrade is completed.

[0093] Step 3: Next, the foamed concrete pavement base course is constructed. Calcium chloride, weighed according to the design mix ratio, is dissolved in water to prepare a solution and then stirred evenly with water glass to prepare a mixed solution. Then, aluminate cement, basalt fiber, and air bubbles made from nanomaterial foaming agents are added sequentially to the mixed solution and mixed evenly to prepare foamed concrete slurry.

[0094] Step 4: Pour the foamed concrete slurry in layers, with each layer being 0.20m thick, for a total foamed concrete pavement base layer thickness of 0.20m. After each layer of foamed concrete is poured, it is immediately cured for 11 days. Once cured, the foamed concrete pavement base layer is formed.

[0095] Step 5: Next, the micro-bubble asphalt mixture pavement surface layer is constructed. The base asphalt is heated to the design temperature, and then water-based epoxy resin, well-mixed silica fume and limestone powder, graded crushed stone, and bubbles made from nanomaterial foaming agents are added to the heated base asphalt in sequence and stirred evenly to make micro-bubble asphalt mixture.

[0096] Step 6: Use a paver to pave the micro-bubble asphalt mixture, with each layer being 10cm thick; after paving, use a double-drum roller to compact it using static pressure, resulting in a road surface layer thickness of 20cm; immediately after compaction, carry out curing for 9 days, and after curing, the micro-bubble asphalt mixture road surface layer is obtained.

[0097] Once the above steps are completed, the construction of the entire foamed road structure is finished.

[0098] Example 3

[0099] A foamed road structure comprises, from bottom to top, an aerated concrete subgrade, a foamed concrete base course, and a micro-bubble asphalt mixture surface course. The aerated concrete subgrade is prepared by mixing 120 parts phosphate cement, 100 parts sulfoaluminate cement, 35 parts carbide slag, and 17 parts phosphogypsum as cementing materials, 450 parts clay as raw soil, 25 parts modified polymer as a foaming agent, and 250 parts water. The foamed concrete base course is prepared by mixing 825 parts aluminate cement, 70 parts water glass, and 100 parts calcium chloride as cementing materials, 5 parts basalt fiber as an admixture, and 70 parts animal protein as a foaming agent, with water. The micro-bubble asphalt mixture surface course is prepared by mixing 52 parts base asphalt as cementing material, 32 parts graded crushed stone as aggregate, 25 parts silica fume and 50 parts limestone powder as active fillers, 16 parts waterborne epoxy resin as an admixture, and 88 parts organic nanomaterials as a foaming agent, with 600 parts water. The wet unit weight of the aerated concrete subgrade is 5.5 kN / m³. 3 The wet density of the foamed concrete pavement base course is 11.5 kN / m³. 3 The wet density of the microbubbly asphalt mixture pavement surface layer is 21 kN / m³. 3 .

[0100] A construction process for foamed road structures involves constructing the subgrade, base course, and surface course of micro-bubble asphalt mixture in a bottom-up sequence. The specific construction steps are as follows:

[0101] Step 1: First, construct the aerated concrete roadbed. Weigh out each cementitious material component, silty clay, and water according to the design mix ratio, mix them evenly, add air bubbles made from a modified polymer foaming agent, and mix evenly to prepare the aerated concrete slurry.

[0102] Step 2: Lay a layer of geotextile on the subgrade surface, and then pour the aerated concrete slurry in layers, with each layer being 1.0m thick, until the design thickness of the subgrade is reached; after each layer of aerated concrete slurry is poured, it is immediately cured until the aerated concrete slurry has the basic strength to meet the requirements for personnel to carry out construction work, and then lay a layer of mesh cloth on it; after the mesh cloth is laid, continue to cure, with a total curing period of 11 days, and after curing, the aerated concrete slurry subgrade is completed.

[0103] Step 3: Next, the foamed concrete pavement base course is constructed. Calcium chloride, weighed according to the design mix ratio, is dissolved in water to prepare a solution and then stirred evenly with water glass to prepare a mixed solution. Then, aluminate cement, basalt fiber, and air bubbles made from nanomaterial foaming agents are added sequentially to the mixed solution and mixed evenly to prepare foamed concrete slurry.

[0104] Step 4: Pour the foamed concrete slurry in layers, with each layer being 0.16m thick, for a total foamed concrete pavement base layer thickness of 0.32m. Curing should begin immediately after each layer is poured, with a curing period of 12 days. Once cured, the foamed concrete pavement base layer is complete.

[0105] Step 5: Next, construct the microbubble asphalt mixture pavement surface layer. Heat the base asphalt to the design temperature, then add water-based epoxy resin, evenly mixed silica fume and limestone powder, graded crushed stone, and bubbles made from nanomaterial foaming agents to the heated base asphalt in sequence and stir evenly to produce microbubble asphalt mixture.

[0106] Step 6: Use a paver to pave the micro-bubble asphalt mixture, with each layer being 4cm thick; after paving, use a double-drum roller to compact it using static pressure, resulting in a pavement surface layer thickness of 16cm; immediately after compaction, carry out curing for 10 days, and after curing, the micro-bubble asphalt mixture pavement surface layer is obtained.

[0107] Once the above steps are completed, the construction of the entire foamed road structure is finished.

[0108] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A foamed mixture road structure, characterized by, The bubble mixed soil roadbed, the foam concrete pavement base layer and the micro-bubble asphalt mixture pavement surface layer are sequentially arranged from bottom to top; the bubble mixed soil roadbed is prepared by mixing and stirring 100-150 parts of phosphate cement, 50-150 parts of sulphoaluminate cement, 20-40 parts of carbide slag, 10-20 parts of phosphor gesso, 400-600 parts of raw soil, 20-40 parts of modified polymer foaming agent and 150-300 parts of water; the foam concrete pavement base layer is prepared by mixing and stirring 750-900 parts of aluminate cement, 50-100 parts of water glass, 30-100 parts of calcium chloride, 2-5 parts of basalt fiber, 50-70 parts of animal protein foaming agent and 450-700 parts of water; and the micro-bubble asphalt mixture pavement surface layer is prepared by mixing and stirring 40-60 parts of base asphalt as binder, 20-40 parts of graded gravel as aggregate, 20-40 parts of silica fume and 30-50 parts of limestone powder as active filler, 10-20 parts of water-based epoxy resin as additive, 80-100 parts of organic nano material as foaming agent and 450-700 parts of water. The modified polymer foaming agent is prepared by a series of polymerization reactions of amphiphilic block polymer polystyrene-polyacrylic acid and a surfactant.

2. A foamed mixture road structure according to claim 1, characterised in that, The animal protein foaming agent is prepared by adding a certain amount of caustic soda, hydrochloric acid and sodium chloride to animal keratin protein, and then performing processes of warming and dissolving, dilution and filtration, and high-temperature dehydration.

3. A foamed mixture road structure according to claim 1, characterised in that, The organic nano material foaming agent refers to an foaming agent prepared by adding an organic nano polymer to an ionic foaming agent and through a self-assembly effect of the organic nano polymer.

4. A foamed mixture road structure according to claim 1, characterised in that, The wet bulk density of the bubble mixed soil roadbed is not less than 3.5 kN / m3, the wet bulk density of the foam concrete pavement base layer is not less than 10 kN / m3, and the wet bulk density of the micro-bubble asphalt mixture pavement surface layer is not less than 20 kN / m3.

5. A method of constructing a foamed mixture road, characterized by, The foam mixture road structure comprises the bubble mixed soil roadbed, the foam concrete pavement base layer and the micro-bubble asphalt mixture pavement surface layer, and specifically comprises the following steps: S01: mixing and stirring 100-150 parts of phosphate cement, 50-150 parts of sulphoaluminate cement, 20-40 parts of carbide slag, 10-20 parts of phosphor gesso, 400-600 parts of raw soil, 20-40 parts of modified polymer foaming agent and 150-300 parts of water according to the designed mixing ratio to prepare a slurry of the bubble mixed soil; S02: laying a layer of geotextile on the roadbed bottom surface, and then layer-by-layer pouring the slurry of the bubble mixed soil, with the thickness of each layer being 0.3-1.0 m, until the designed thickness of the roadbed, and laying a layer of mesh cloth on each layer of the bubble mixed soil, to prepare the bubble mixed soil roadbed after curing; S03: mixing and stirring 750-900 parts of aluminate cement, 50-100 parts of water glass, 30-100 parts of calcium chloride, 2-5 parts of basalt fiber, 50-70 parts of animal protein foaming agent and 450-700 parts of water according to the designed mixing ratio to prepare a slurry of the foam concrete; S04: layering the slurry pouring of the foam concrete, each layer pouring thickness is 0.12-0.24 m, the total thickness of the foam concrete pavement base layer is 0.20-0.48 m, and the foam concrete pavement base layer is prepared after curing; S05: the matrix asphalt is heated according to the design mixing ratio, then the graded gravel 20-40 parts, the silica ash 20-40 parts, the limestone powder 30-50 parts, the water-based epoxy resin 10-20 parts, the organic nano material 80-100 parts and water 450-700 parts are added into the heated matrix asphalt and stirred uniformly to prepare the micro-bubble asphalt mixture; S06: the micro-bubble asphalt mixture is layered and paved by using a paver, each layer paving thickness is 4-10 cm, and the pavement surface layer thickness is 10-20 cm after rolling in a static pressure manner, the micro-bubble asphalt mixture pavement surface layer is prepared after curing, and the foam mixture road structure construction is finally completed.

6. A method of constructing a foamed mixture road according to claim 5, wherein The curing is immediately performed after each layer of the bubble mixture soil construction in the step S02, and the curing age is not less than 10 d; The curing is immediately performed after the layered foam concrete pouring in the step S04, and the curing age is not less than 10 d; The curing is immediately performed after the micro-bubble asphalt mixture pavement surface layer rolling in the step S06, and the curing age is not less than 8 d.

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